how to pass values between two opened form

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how to pass values between two opened form

I have One MDIMain Forms in that I have two form.
Both are opened, now I have to passed a value from One Child form to the TextField of Second Child Form without creating a new object of that form.
I want to find the instance of opened form and then pass the value.

How can I do this.

Appreciate your reply

Thanking You

Posted 22-Nov-10 2:27am

shanawazway

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3 solutions

Solution 1

Why don't you just create a static string value that is global to the app, and use it in both forms...

Posted 22-Nov-10 2:30am

#realJSOP

Solution 2

--Form1

C#

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    public static string CCName = "ClassCoder";
    private void button1_Click(object sender, EventArgs e)
    {
        Form2 frm2 = new Form2();
        frm2.Show();
    }
}

--Form2

C#

public partial class Form2 : Form
{
    public Form2()
    {
        InitializeComponent();
    }
    public string CCName;
    private void button1_Click(object sender, EventArgs e)
    {
        MessageBox.Show(CCName);
    }
    private void Form2_Load(object sender, EventArgs e)
    {
        CCName = Form1.CCName;
    }
}

Posted 22-Nov-10 3:18am

alrosan

Comments

shanawazway 23-Nov-10 0:13am

Hi,
As I mentioned in the question, I don't have to create a new object of Form.
In Form1 Button1 Click ,it is creating a new object, which create and open a new form (not MDI Child form).
It means we have to opened Forms of same name like Form, one is MDIChild Form1 and other is independent Form1.

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Dylan Morley · Accepted Answer · 2010-11-22T06:08:00

You can enumerate the MDI children of MDIMain

For each form, test to find out if it's the form you want. Check for form type I guess?

To pass it data, you need a method on the form that will accept data input. You could cast from Form to an Interface that exposes a method

Define Interface

C#

public interface ISendFormData
{
    void SendData(object data);
}

Implement interface on Form2

C#

public partial class Form2 : Form, ISendFormData
{
    public Form2()
    {
        InitializeComponent();
    }
    public void SendData(object data)
    {
        // do something with the data object
    }
}

C#

foreach Form f in this.MDIChildren 
{
    Type t = f.GetType();

    if (t == typeof(Form2) && t.GetInterface("ISendFormData", true) != null)
    {
        ISendFormData myForm = (ISendFormData)f;
        myForm.SendData("Whatever you like in here!");
        break;
    }
}